I'm about to build a mini ITX Server using a DH77DF MB with an i7 3770.
I'm gonna be using the 2 x Sata 6 Gbps ports to host a RAID 0 array (HDDs) and the 2 x Sata 3 Gbps
for a RAID 1 (also HDDs), so there will be no Sata connector left. Thus, I will need to use the mSata
port to put one of your new 525 SSD which will serve as a VM datastore.
So, here are my questions :
1) I understand that the mSata port uses an adapter to be fitted in the PCIe slot. So, in other
words, if I want to use mSata at all, I can say good bye to the PCIe 16x slot, is that correct ?
2) Now, speed-wise, from what I gathered, mSata does handle Sata 3 speeds but is ultimately handled
by the H77 Sata controller which only supports 2 drives in Sata 3 / 6 Gbps mode.
So, which disks will have priority for Sata 3 speed in that case (2xSata3 + mSata connected) ?
I'm guessing not the mSata...
3) If so, will I be able to set the Sata 3 ports to run at Sata 2 speed so that only the mSata runs
@6Gbps and the other four HDDs @3Gbps (as Sata 3 is really not needed for HDDs) ?
Hello Wam, I will try to answer your questions.
1) If you install a Solid-State Drive on the PCI Express* slot, you wont be able to use it for anything else.
2) If you install the Solid-State Drive on the PCI Express* the bus that will be used if for the PCI Express*, you shouldn't have any problems related to speed.
3) There is no way to force the SATA ports to work at a different specification and there is no need to as per what I explained before.
Thank you for your answer, but that's not exactly what I was asking for point # 2.
Yes, I know the PCI Express bus will be used, but I'm actually worried about the Sata controller. Are you saying that both disks connected to the Sata 3 ports AND the mSata SSD will run at 6 Gbps ?
That's my real problem here as the chipset is only supposed to handle 2 Sata 3 disks as per the H77 specification.
Well, to be honest, I really thought (when I first asked) that I would get a confirmation that mSata would not run at 6Gpbs because that would go against the http://www.intel.com/support/motherboards/desktop/dh77df/sb/CS-033186.htm H77 PCH specifications (section 1.5.4) which states it handles only two sata 3 interfaces and 4 sata 2.
I guess I'm gonna have to test it to find out, as it seems difficult to get a definitive technical explanation.
Thank you for your time.
I installed a http://storage.toshiba.eu/cms/en/hdd/solid_state_drives/product_detail.jsp?productid=556 Toshiba THNSNH128GMCT 128 Gb SATA 6 Gb/s SSD into DH77DF's mSata slot and it actually works at only SATA 3Gb/s.
Sequential Read : 270.513 MB/s
Sequential Write : 167.024 MB/s
Random Read 512KB : 246.356 MB/s
Random Write 512KB : 166.772 MB/s
Random Read 4KB (QD=1) : 21.816 MB/s [ 5326.2 IOPS]
Random Write 4KB (QD=1) : 53.102 MB/s [ 12964.3 IOPS]
Random Read 4KB (QD=32) : 184.863 MB/s [ 45132.5 IOPS]
Random Write 4KB (QD=32) : 125.076 MB/s [ 30536.2 IOPS]
The PCH support a maximum of two 6.0 Gb/s SATA ports, since this specific motherboard comes with two 6.0 SATA ports (blue regular SATA ports), the speed of the mSata will be a 3.0 Gb/s.
You can use a 6.0 Gb/s SSD on that port, but the transfer rate will be 3.0 Gb/s, like in your case.